Very good work - but typically we don't build prospectivity models this way (or rather we don't validate them this way anymore). Great to see the USGS starting to dip their toe back in this though, they and the GSC were long the leaders in this, but have dropped it on the last 5-7 years.
Dead Comment
It's very easy to come up with a back of the envelope calculation to say we have this much Lithium, or this much Copper and come up with an absolute whopper of a number, the question is how much of it is recoverable and can it form part of a resource. There's a reason we (mining industry) don't let people produce these kind of numbers offhand, it's wildly speculatory and holds no basis in mining reality (yet!) - however very cool stuff and might provide a new exploration target in the future.